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SELECT 
  SQL_CALC_FOUND_ROWS products.product_id, 
  IF(
    shared_descr.product_id IS NOT NULL, 
    shared_descr.product, descr1.product
  ) as product, 
  companies.company as company_name, 
  products.product_type, 
  products.parent_product_id 
FROM 
  cscart_products as products 
  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 cscart_categories.category_id IN (
    280, 306, 307, 309, 283, 292, 287, 282, 
    293, 288, 286, 284, 285, 314, 289, 291, 
    294, 290, 301, 295, 300, 302, 303, 304, 
    305, 318, 319, 322, 324
  ) 
  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) 
  AND products.parent_product_id = 0 
GROUP BY 
  products.product_id 
ORDER BY 
  product asc, 
  products.product_id ASC 
LIMIT 
  24, 24

Query time 0.01186

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "56.08"
    },
    "ordering_operation": {
      "using_filesort": true,
      "grouping_operation": {
        "using_temporary_table": true,
        "using_filesort": false,
        "nested_loop": [
          {
            "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": "cscart_categories",
              "access_type": "ALL",
              "possible_keys": [
                "PRIMARY",
                "c_status",
                "p_category_id"
              ],
              "rows_examined_per_scan": 46,
              "rows_produced_per_join": 1,
              "filtered": "2.52",
              "using_join_buffer": "hash join",
              "cost_info": {
                "read_cost": "5.23",
                "eval_cost": "0.12",
                "prefix_cost": "6.07",
                "data_read_per_join": "4K"
              },
              "used_columns": [
                "category_id",
                "storefront_id",
                "usergroup_ids",
                "status"
              ],
              "attached_condition": "((`test2_gaseus`.`cscart_categories`.`category_id` in (280,306,307,309,283,292,287,282,293,288,286,284,285,314,289,291,294,290,301,295,300,302,303,304,305,318,319,322,324)) and ((`test2_gaseus`.`cscart_categories`.`usergroup_ids` = '') or (0 <> find_in_set(0,`test2_gaseus`.`cscart_categories`.`usergroup_ids`)) or (0 <> find_in_set(1,`test2_gaseus`.`cscart_categories`.`usergroup_ids`))) and (`test2_gaseus`.`cscart_categories`.`status` in ('A','H')) and (`test2_gaseus`.`cscart_categories`.`storefront_id` in (0,1)))"
            }
          },
          {
            "table": {
              "table_name": "products_categories",
              "access_type": "ref",
              "possible_keys": [
                "PRIMARY",
                "pt"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "category_id"
              ],
              "key_length": "3",
              "ref": [
                "test2_gaseus.cscart_categories.category_id"
              ],
              "rows_examined_per_scan": 83,
              "rows_produced_per_join": 96,
              "filtered": "100.00",
              "using_index": true,
              "cost_info": {
                "read_cost": "0.88",
                "eval_cost": "9.63",
                "prefix_cost": "16.58",
                "data_read_per_join": "1K"
              },
              "used_columns": [
                "product_id",
                "category_id"
              ]
            }
          },
          {
            "table": {
              "table_name": "products",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "status",
                "idx_parent_product_id"
              ],
              "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": 4,
              "filtered": "5.00",
              "cost_info": {
                "read_cost": "24.07",
                "eval_cost": "0.48",
                "prefix_cost": "50.28",
                "data_read_per_join": "31K"
              },
              "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`.`parent_product_id` = 0) 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": 4,
              "filtered": "99.91",
              "cost_info": {
                "read_cost": "1.20",
                "eval_cost": "0.48",
                "prefix_cost": "51.97",
                "data_read_per_join": "115"
              },
              "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": 4,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "1.20",
                "eval_cost": "0.48",
                "prefix_cost": "53.65",
                "data_read_per_join": "18K"
              },
              "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": 4,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "1.95",
                "eval_cost": "0.48",
                "prefix_cost": "56.08",
                "data_read_per_join": "21K"
              },
              "used_columns": [
                "product_id",
                "lang_code",
                "product"
              ]
            }
          }
        ]
      }
    }
  }
}

Result

product_id	product	company_name	product_type
6953	Linde Base module 2x1 FBA/BBA-21-M-300 O2	Gaseus	P
3484	Linde Connection seal 18x11.8x2 mm	Gaseus	P
3487	Linde Connection seal nitrous oxide/ test gas	Gaseus	P
3485	Linde Connection sealing 15x9,2x2mm	Gaseus	P
3486	Linde Connection Sealing 18x11,6x2 mm	Gaseus	P
6969	Linde Gas pre-heater modul FBA/BBA, PN300 for cyr- and bundle manifold 200W	Gaseus	P
3434	Linde Gas preheater GPH 200 inert gases DIN 477-1 200 bar	Gaseus	P
6947	Linde HP-Bundle hose DN6/PS300,ÜM W21,8RH90°-ÜM SV 12DKOS, 1.000 mm	Gaseus	P
3424	Linde HP-Bundle hose DN6/PS300,ÜM W21,8RH90°-ÜM SV 12DKOS, 1.700 mm	Gaseus	P
3911	Linde HP-Bundle hose 200 bar DN6/PS300, ÜM W24,32RH90°-ÜM SV 12DKOS, 1.000 mm	Gaseus	P
3422	Linde HP-Bundle hose 200 bar DN6/PS300, ÜM W24,32RH90°-ÜM SV 12DKOS, 1.700 mm	Gaseus	P
3910	Linde HP-Bundle hose DN6/PS300, ÜM CEN I, N290°-ÜM SV 12DKOS, 1.000 mm	Gaseus	P
3421	Linde HP-Bundle hose DN6/PS300, ÜM CEN I, N290°-ÜM SV 12DKOS, 1.700 mm	Gaseus	P
3909	Linde HP-Bundle hose DN6/PS300, ÜM CEN O290°-ÜM SV 12DKOS, 1.000 mm	Gaseus	P
3420	Linde HP-Bundle hose DN6/PS300, ÜM CEN O290°-ÜM SV 12DKOS, 1.700 mm	Gaseus	P
3423	Linde HP-Bundle hose DN6/PS300,ÜM G3/4"RH90°-ÜM SV 12DKOS, 1.700 mm	Gaseus	P
3912	Linde HP-Bundle hose DN6/PS300,ÜM G3/4"RH90°-ÜM SV 12DKOS, 1.000 mm	Gaseus	P
3430	Linde In-line regulator L 20 Inertgase, Klemmring 12 mm, 0 - 20 bar	Gaseus	P
3429	Linde In-line regulator LDR-40-20-90 H2	Gaseus	P
3437	Linde In-line regulator LDR-40-20-90 H2	Gaseus	P
3436	Linde In-line regulator LDR-40-20-90 N2	Gaseus	P
3438	Linde In-Line Regulator LDR-40-20-90 O2	Gaseus	P
6959	Linde Manifold FBA/BBA-21-AU-300-15-75-O2/EG	Gaseus	P
3425	Linde Manifold FBA/BBA-21-AU-300-20-160-N2/He/DL	Gaseus	P