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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 (1288)
  ) 
  AND cscart_categories.category_id IN (319) 
  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, 12

Query time 0.00934

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "107.47"
    },
    "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": 115,
                "rows_produced_per_join": 115,
                "filtered": "100.00",
                "using_index": true,
                "cost_info": {
                  "read_cost": "0.96",
                  "eval_cost": "11.50",
                  "prefix_cost": "13.19",
                  "data_read_per_join": "1K"
                },
                "used_columns": [
                  "product_id",
                  "category_id"
                ]
              }
            },
            {
              "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": 115,
                "filtered": "100.00",
                "using_index": true,
                "cost_info": {
                  "read_cost": "28.75",
                  "eval_cost": "11.50",
                  "prefix_cost": "53.44",
                  "data_read_per_join": "88K"
                },
                "used_columns": [
                  "feature_id",
                  "product_id",
                  "variant_id",
                  "lang_code"
                ]
              }
            },
            {
              "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": 11,
                "filtered": "9.95",
                "cost_info": {
                  "read_cost": "28.75",
                  "eval_cost": "1.14",
                  "prefix_cost": "93.69",
                  "data_read_per_join": "74K"
                },
                "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": 11,
                "filtered": "99.91",
                "cost_info": {
                  "read_cost": "2.86",
                  "eval_cost": "1.14",
                  "prefix_cost": "97.69",
                  "data_read_per_join": "274"
                },
                "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": "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": 11,
                "filtered": "100.00",
                "cost_info": {
                  "read_cost": "2.86",
                  "eval_cost": "1.14",
                  "prefix_cost": "101.70",
                  "data_read_per_join": "43K"
                },
                "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": 11,
                "filtered": "100.00",
                "cost_info": {
                  "read_cost": "4.63",
                  "eval_cost": "1.14",
                  "prefix_cost": "107.47",
                  "data_read_per_join": "52K"
                },
                "used_columns": [
                  "product_id",
                  "lang_code",
                  "product"
                ]
              }
            }
          ]
        }
      }
    }
  }
}

Result

product_id	product	company_name	product_ids	product_types	parent_product_ids	product_type
12594	Line pressure regulator Omega I	Gaseus	12594,12595,12596,12597,12598,12599,12600,12601,12602,12603,12604,12605,12606,12607,12608	P,V,V,V,V,V,V,V,V,V,V,V,V,V,V	0,12594,12594,12594,12594,12594,12594,12594,12594,12594,12594,12594,12594,12594,12594	P
12609	Line pressure regulator Omega II	Gaseus	12609,12610,12611,12612,12613,12614,12615,12616,12617,12618,12619,12620,12621,12622,12623	P,V,V,V,V,V,V,V,V,V,V,V,V,V,V	0,12609,12609,12609,12609,12609,12609,12609,12609,12609,12609,12609,12609,12609,12609	P
12424	Line pressure regulator Sigma I	Gaseus	12424,12425,12426,12427,12428,12429,12430,12431,12432,12433,12434,12435,12436,12437,12438,12439,12440,12441,12442,12443,12444,12445,12446,12447,12448,12449,12450,12451,12452,12453,12454,12455,12456,12457,12458,12459,12460,12461,12462,12463	P,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V	0,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424,12424	P
12554	Line pressure regulator Sigma II	Gaseus	12554,12555,12556,12557,12558,12559,12560,12561,12562,12563,12564,12565,12566,12567,12568,12569,12570,12571,12572,12573,12574,12575,12576,12577,12578,12579,12580,12581,12582,12583,12584,12585,12586,12587,12588,12589,12590,12591,12592,12593	P,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V	0,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554,12554	P
12536	Line pressure regulator Thanos	Gaseus	12536,12537,12538,12539,12540,12541,12542,12543,12544,12545	P,V,V,V,V,V,V,V,V,V	0,12536,12536,12536,12536,12536,12536,12536,12536,12536	P
12546	Line pressure regulator Thanos II	Gaseus	12546,12547,12548,12549,12550,12551,12552,12553	P,V,V,V,V,V,V,V	0,12546,12546,12546,12546,12546,12546,12546	P