SELECT 
  SQL_CALC_FOUND_ROWS (
    CASE WHEN products.parent_product_id <> 0 THEN products.parent_product_id ELSE products.product_id END
  ) AS product_id, 
  IF(
    shared_descr.product_id IS NOT NULL, 
    shared_descr.product, descr1.product
  ) as product, 
  companies.company as company_name, 
  GROUP_CONCAT(
    products.product_id 
    ORDER BY 
      products.parent_product_id ASC, 
      products.product_id ASC
  ) AS product_ids, 
  GROUP_CONCAT(
    products.product_type 
    ORDER BY 
      products.parent_product_id ASC, 
      products.product_id ASC
  ) AS product_types, 
  GROUP_CONCAT(
    products.parent_product_id 
    ORDER BY 
      products.parent_product_id ASC, 
      products.product_id ASC
  ) AS parent_product_ids, 
  products.product_type, 
  products.parent_product_id 
FROM 
  cscart_products as products 
  LEFT JOIN cscart_product_features_values as var_val_18 ON var_val_18.product_id = products.product_id 
  AND var_val_18.lang_code = 'en' 
  AND var_val_18.feature_id = 18 
  LEFT JOIN cscart_product_descriptions as descr1 ON descr1.product_id = products.product_id 
  AND descr1.lang_code = 'en' 
  LEFT JOIN cscart_product_prices as prices ON prices.product_id = products.product_id 
  AND prices.lower_limit = 1 
  LEFT JOIN cscart_companies AS companies ON companies.company_id = products.company_id 
  INNER JOIN cscart_products_categories as products_categories ON products_categories.product_id = products.product_id 
  INNER JOIN cscart_categories ON cscart_categories.category_id = products_categories.category_id 
  AND (
    cscart_categories.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_categories.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_categories.usergroup_ids
    )
  ) 
  AND cscart_categories.status IN ('A', 'H') 
  AND cscart_categories.storefront_id IN (0, 1) 
  LEFT JOIN cscart_ult_product_descriptions shared_descr ON shared_descr.product_id = products.product_id 
  AND shared_descr.company_id = 1 
  AND shared_descr.lang_code = 'en' 
WHERE 
  1 
  AND (
    var_val_18.variant_id IN (1202)
  ) 
  AND cscart_categories.category_id IN (312) 
  AND companies.status IN ('A') 
  AND (
    products.usergroup_ids = '' 
    OR FIND_IN_SET(0, products.usergroup_ids) 
    OR FIND_IN_SET(1, products.usergroup_ids)
  ) 
  AND products.status IN ('A') 
  AND prices.usergroup_id IN (0, 0, 1) 
GROUP BY 
  product_id 
ORDER BY 
  product asc, 
  products.product_id ASC 
LIMIT 
  0, 96

Query time 0.00672

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "113.38"
    },
    "ordering_operation": {
      "using_filesort": true,
      "grouping_operation": {
        "using_temporary_table": true,
        "using_filesort": true,
        "buffer_result": {
          "using_temporary_table": true,
          "nested_loop": [
            {
              "table": {
                "table_name": "cscart_categories",
                "access_type": "const",
                "possible_keys": [
                  "PRIMARY",
                  "c_status",
                  "p_category_id"
                ],
                "key": "PRIMARY",
                "used_key_parts": [
                  "category_id"
                ],
                "key_length": "3",
                "ref": [
                  "const"
                ],
                "rows_examined_per_scan": 1,
                "rows_produced_per_join": 1,
                "filtered": "100.00",
                "cost_info": {
                  "read_cost": "0.00",
                  "eval_cost": "0.10",
                  "prefix_cost": "0.00",
                  "data_read_per_join": "4K"
                },
                "used_columns": [
                  "category_id",
                  "storefront_id",
                  "usergroup_ids",
                  "status"
                ]
              }
            },
            {
              "table": {
                "table_name": "companies",
                "access_type": "ALL",
                "possible_keys": [
                  "PRIMARY"
                ],
                "rows_examined_per_scan": 2,
                "rows_produced_per_join": 1,
                "filtered": "50.00",
                "cost_info": {
                  "read_cost": "0.62",
                  "eval_cost": "0.10",
                  "prefix_cost": "0.72",
                  "data_read_per_join": "5K"
                },
                "used_columns": [
                  "company_id",
                  "status",
                  "company"
                ],
                "attached_condition": "(`test2_gaseus`.`companies`.`status` = 'A')"
              }
            },
            {
              "table": {
                "table_name": "products_categories",
                "access_type": "ref",
                "possible_keys": [
                  "PRIMARY",
                  "pt"
                ],
                "key": "PRIMARY",
                "used_key_parts": [
                  "category_id"
                ],
                "key_length": "3",
                "ref": [
                  "const"
                ],
                "rows_examined_per_scan": 184,
                "rows_produced_per_join": 184,
                "filtered": "100.00",
                "using_index": true,
                "cost_info": {
                  "read_cost": "1.39",
                  "eval_cost": "18.40",
                  "prefix_cost": "20.52",
                  "data_read_per_join": "2K"
                },
                "used_columns": [
                  "product_id",
                  "category_id"
                ]
              }
            },
            {
              "table": {
                "table_name": "products",
                "access_type": "eq_ref",
                "possible_keys": [
                  "PRIMARY",
                  "status"
                ],
                "key": "PRIMARY",
                "used_key_parts": [
                  "product_id"
                ],
                "key_length": "3",
                "ref": [
                  "test2_gaseus.products_categories.product_id"
                ],
                "rows_examined_per_scan": 1,
                "rows_produced_per_join": 18,
                "filtered": "9.95",
                "cost_info": {
                  "read_cost": "46.00",
                  "eval_cost": "1.83",
                  "prefix_cost": "84.92",
                  "data_read_per_join": "119K"
                },
                "used_columns": [
                  "product_id",
                  "product_type",
                  "status",
                  "company_id",
                  "usergroup_ids",
                  "parent_product_id"
                ],
                "attached_condition": "((`test2_gaseus`.`products`.`company_id` = `test2_gaseus`.`companies`.`company_id`) and ((`test2_gaseus`.`products`.`usergroup_ids` = '') or (0 <> find_in_set(0,`test2_gaseus`.`products`.`usergroup_ids`)) or (0 <> find_in_set(1,`test2_gaseus`.`products`.`usergroup_ids`))) and (`test2_gaseus`.`products`.`status` = 'A'))"
              }
            },
            {
              "table": {
                "table_name": "prices",
                "access_type": "ref",
                "possible_keys": [
                  "usergroup",
                  "product_id",
                  "lower_limit",
                  "usergroup_id"
                ],
                "key": "product_id",
                "used_key_parts": [
                  "product_id"
                ],
                "key_length": "3",
                "ref": [
                  "test2_gaseus.products_categories.product_id"
                ],
                "rows_examined_per_scan": 1,
                "rows_produced_per_join": 18,
                "filtered": "99.91",
                "cost_info": {
                  "read_cost": "4.58",
                  "eval_cost": "1.83",
                  "prefix_cost": "91.33",
                  "data_read_per_join": "439"
                },
                "used_columns": [
                  "product_id",
                  "lower_limit",
                  "usergroup_id"
                ],
                "attached_condition": "((`test2_gaseus`.`prices`.`lower_limit` = 1) and (`test2_gaseus`.`prices`.`usergroup_id` in (0,0,1)))"
              }
            },
            {
              "table": {
                "table_name": "var_val_18",
                "access_type": "eq_ref",
                "possible_keys": [
                  "PRIMARY",
                  "fl",
                  "variant_id",
                  "lang_code",
                  "product_id",
                  "fpl",
                  "idx_product_feature_variant_id"
                ],
                "key": "PRIMARY",
                "used_key_parts": [
                  "feature_id",
                  "product_id",
                  "variant_id",
                  "lang_code"
                ],
                "key_length": "15",
                "ref": [
                  "const",
                  "test2_gaseus.products_categories.product_id",
                  "const",
                  "const"
                ],
                "rows_examined_per_scan": 1,
                "rows_produced_per_join": 18,
                "filtered": "100.00",
                "using_index": true,
                "cost_info": {
                  "read_cost": "4.57",
                  "eval_cost": "1.83",
                  "prefix_cost": "97.73",
                  "data_read_per_join": "14K"
                },
                "used_columns": [
                  "feature_id",
                  "product_id",
                  "variant_id",
                  "lang_code"
                ]
              }
            },
            {
              "table": {
                "table_name": "shared_descr",
                "access_type": "eq_ref",
                "possible_keys": [
                  "PRIMARY",
                  "product_id",
                  "company_id"
                ],
                "key": "PRIMARY",
                "used_key_parts": [
                  "product_id",
                  "lang_code",
                  "company_id"
                ],
                "key_length": "13",
                "ref": [
                  "test2_gaseus.products_categories.product_id",
                  "const",
                  "const"
                ],
                "rows_examined_per_scan": 1,
                "rows_produced_per_join": 18,
                "filtered": "100.00",
                "cost_info": {
                  "read_cost": "4.57",
                  "eval_cost": "1.83",
                  "prefix_cost": "104.14",
                  "data_read_per_join": "69K"
                },
                "used_columns": [
                  "product_id",
                  "lang_code",
                  "company_id",
                  "product"
                ]
              }
            },
            {
              "table": {
                "table_name": "descr1",
                "access_type": "eq_ref",
                "possible_keys": [
                  "PRIMARY",
                  "product_id"
                ],
                "key": "PRIMARY",
                "used_key_parts": [
                  "product_id",
                  "lang_code"
                ],
                "key_length": "9",
                "ref": [
                  "test2_gaseus.products_categories.product_id",
                  "const"
                ],
                "rows_examined_per_scan": 1,
                "rows_produced_per_join": 18,
                "filtered": "100.00",
                "cost_info": {
                  "read_cost": "7.41",
                  "eval_cost": "1.83",
                  "prefix_cost": "113.38",
                  "data_read_per_join": "83K"
                },
                "used_columns": [
                  "product_id",
                  "lang_code",
                  "product"
                ]
              }
            }
          ]
        }
      }
    }
  }
}

Result

product_id product company_name product_ids product_types parent_product_ids product_type parent_product_id
13124 Manual base station for acetylene Vulkan TecLine Modula Vareo BSA 10 B Gaseus 13124 P 0 P 0
13125 Manual base station for acetylene Vulkan TecLine Modula Vareo BSA 20 B Gaseus 13125 P 0 P 0
13126 Manual base station for acetylene Vulkan TecLine Modula Vareo BSA 40 B Gaseus 13126 P 0 P 0
13098 Manual base station Vulkan TecLine Modula Vareo BS 100/300 Gaseus 13098,13099,13100,13101,13102,13103,13104 P,V,V,V,V,V,V 0,13098,13098,13098,13098,13098,13098 P 0
13105 Manual base station Vulkan TecLine Modula Vareo BS 120/300 Gaseus 13105,13106,13107,13108,13109,13110,13111 P,V,V,V,V,V,V 0,13105,13105,13105,13105,13105,13105 P 0
13112 Manual base station Vulkan TecLine Modula Vareo BS 200/300 Gaseus 13112,13113,13114,13115,13116,13117 P,V,V,V,V,V 0,13112,13112,13112,13112,13112 P 0
13118 Manual base station Vulkan TecLine Modula Vareo BS 270/300 Gaseus 13118,13119,13120,13121,13122,13123 P,V,V,V,V,V 0,13118,13118,13118,13118,13118 P 0
13064 Manual base station Vulkan TecLine Modula Vareo BS 50/300 Gaseus 13064,13065,13066,13067,13068,13069,13070 P,V,V,V,V,V,V 0,13064,13064,13064,13064,13064,13064 P 0
13071 Manual base station Vulkan TecLine Modula Vareo BS 60/300 Gaseus 13071,13072,13073,13074,13075,13076,13077 P,V,V,V,V,V,V 0,13071,13071,13071,13071,13071,13071 P 0
13078 Manual base station Vulkan TecLine Modula Vareo BS 70/300 Gaseus 13078,13079,13080,13081,13082,13083,13084 P,V,V,V,V,V,V 0,13078,13078,13078,13078,13078,13078 P 0
13085 Manual base station Vulkan TecLine Modula Vareo BS 75/300 Gaseus 13085,13086,13087,13088,13089,13090 P,V,V,V,V,V 0,13085,13085,13085,13085,13085 P 0
13091 Manual base station Vulkan TecLine Modula Vareo BS 80/300 Gaseus 13091,13092,13093,13094,13095,13096,13097 P,V,V,V,V,V,V 0,13091,13091,13091,13091,13091,13091 P 0
12956 Single-bundle acetylene manifold station Vulkan TecLine EB10 Gaseus 12956,12957 P,V 0,12956 P 0
12958 Single-bundle acetylene manifold station Vulkan TecLine EB20 Gaseus 12958,12959 P,V 0,12958 P 0
13014 Single-bundle manifold station Vulkan TecLine EB100/300 Gaseus 13014,13015,13016,13017,13018,13019,13020,13021,13022,13023,13024,13025,13026,13027 P,V,V,V,V,V,V,V,V,V,V,V,V,V 0,13014,13014,13014,13014,13014,13014,13014,13014,13014,13014,13014,13014,13014 P 0
13028 Single-bundle manifold station Vulkan TecLine EB120/300 Gaseus 13028,13029,13030,13031,13032,13033,13034,13035,13036,13037,13038,13039 P,V,V,V,V,V,V,V,V,V,V,V 0,13028,13028,13028,13028,13028,13028,13028,13028,13028,13028,13028 P 0
13040 Single-bundle manifold station Vulkan TecLine EB200/300 Gaseus 13040,13041,13042,13043,13044,13045,13046,13047,13048,13049,13050,13051 P,V,V,V,V,V,V,V,V,V,V,V 0,13040,13040,13040,13040,13040,13040,13040,13040,13040,13040,13040 P 0
13052 Single-bundle manifold station Vulkan TecLine EB270/300 Gaseus 13052,13053,13054,13055,13056,13057,13058,13059,13060,13061,13062,13063 P,V,V,V,V,V,V,V,V,V,V,V 0,13052,13052,13052,13052,13052,13052,13052,13052,13052,13052,13052 P 0
12960 Single-bundle manifold station Vulkan TecLine EB60/300 Gaseus 12960,12961,12962,12963,12964,12965,12966,12967,12968,12969,12970,12971,12972,12973 P,V,V,V,V,V,V,V,V,V,V,V,V,V 0,12960,12960,12960,12960,12960,12960,12960,12960,12960,12960,12960,12960,12960 P 0
12974 Single-bundle manifold station Vulkan TecLine EB70/300 Gaseus 12974,12975,12976,12977,12978,12979,12980,12981,12982,12983,12984,12985,12986,12987 P,V,V,V,V,V,V,V,V,V,V,V,V,V 0,12974,12974,12974,12974,12974,12974,12974,12974,12974,12974,12974,12974,12974 P 0
12988 Single-bundle manifold station Vulkan TecLine EB75/300 Gaseus 12988,12989,12990,12991,12992,12993,12994,12995,12996,12997,12998,12999 P,V,V,V,V,V,V,V,V,V,V,V 0,12988,12988,12988,12988,12988,12988,12988,12988,12988,12988,12988 P 0
13000 Single-bundle manifold station Vulkan TecLine EB80/300 Gaseus 13000,13001,13002,13003,13004,13005,13006,13007,13008,13009,13010,13011,13012,13013 P,V,V,V,V,V,V,V,V,V,V,V,V,V 0,13000,13000,13000,13000,13000,13000,13000,13000,13000,13000,13000,13000,13000 P 0
12926 Single-cylinder manifold station Vulkan TecLine SE10/300 Gaseus 12926,12927,12930,12931,12932,12933,12934,12935,12936,12937,12938,12939,12940,12941 P,V,V,V,V,V,V,V,V,V,V,V,V,V 0,12926,12926,12926,12926,12926,12926,12926,12926,12926,12926,12926,12926,12926 P 0
12942 Single-cylinder manifold station Vulkan TecLine SE20/300 Gaseus 12942,12943,12944,12945,12946,12947,12948,12949,12950,12951,12952,12953,12954,12955 P,V,V,V,V,V,V,V,V,V,V,V,V,V 0,12942,12942,12942,12942,12942,12942,12942,12942,12942,12942,12942,12942,12942 P 0