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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 (
    266, 308, 272, 267, 273, 312, 271, 270, 
    274
  ) 
  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 
  0, 48

Query time 0.10433

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "27.79"
    },
    "ordering_operation": {
      "using_filesort": true,
      "grouping_operation": {
        "using_temporary_table": true,
        "using_filesort": false,
        "nested_loop": [
          {
            "table": {
              "table_name": "cscart_categories",
              "access_type": "range",
              "possible_keys": [
                "PRIMARY",
                "c_status",
                "p_category_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "category_id"
              ],
              "key_length": "3",
              "rows_examined_per_scan": 9,
              "rows_produced_per_join": 0,
              "filtered": "4.00",
              "index_condition": "(`gaseus`.`cscart_categories`.`category_id` in (266,308,272,267,273,312,271,270,274))",
              "cost_info": {
                "read_cost": "6.27",
                "eval_cost": "0.04",
                "prefix_cost": "6.31",
                "data_read_per_join": "1K"
              },
              "used_columns": [
                "category_id",
                "storefront_id",
                "usergroup_ids",
                "status"
              ],
              "attached_condition": "(((`gaseus`.`cscart_categories`.`usergroup_ids` = '') or (0 <> find_in_set(0,`gaseus`.`cscart_categories`.`usergroup_ids`)) or (0 <> find_in_set(1,`gaseus`.`cscart_categories`.`usergroup_ids`))) and (`gaseus`.`cscart_categories`.`status` in ('A','H')) and (`gaseus`.`cscart_categories`.`storefront_id` in (0,1)))"
            }
          },
          {
            "table": {
              "table_name": "companies",
              "access_type": "ALL",
              "possible_keys": [
                "PRIMARY"
              ],
              "rows_examined_per_scan": 2,
              "rows_produced_per_join": 0,
              "filtered": "50.00",
              "using_join_buffer": "hash join",
              "cost_info": {
                "read_cost": "0.62",
                "eval_cost": "0.04",
                "prefix_cost": "6.97",
                "data_read_per_join": "1K"
              },
              "used_columns": [
                "company_id",
                "status",
                "company"
              ],
              "attached_condition": "(`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": [
                "gaseus.cscart_categories.category_id"
              ],
              "rows_examined_per_scan": 110,
              "rows_produced_per_join": 39,
              "filtered": "100.00",
              "using_index": true,
              "cost_info": {
                "read_cost": "0.34",
                "eval_cost": "3.96",
                "prefix_cost": "11.27",
                "data_read_per_join": "633"
              },
              "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": [
                "gaseus.products_categories.product_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 1,
              "filtered": "5.00",
              "cost_info": {
                "read_cost": "9.90",
                "eval_cost": "0.20",
                "prefix_cost": "25.13",
                "data_read_per_join": "12K"
              },
              "used_columns": [
                "product_id",
                "product_type",
                "status",
                "company_id",
                "usergroup_ids",
                "parent_product_id"
              ],
              "attached_condition": "((`gaseus`.`products`.`company_id` = `gaseus`.`companies`.`company_id`) and (`gaseus`.`products`.`parent_product_id` = 0) and ((`gaseus`.`products`.`usergroup_ids` = '') or (0 <> find_in_set(0,`gaseus`.`products`.`usergroup_ids`)) or (0 <> find_in_set(1,`gaseus`.`products`.`usergroup_ids`))) and (`gaseus`.`products`.`status` = 'A'))"
            }
          },
          {
            "table": {
              "table_name": "prices",
              "access_type": "ref",
              "possible_keys": [
                "usergroup",
                "product_id",
                "lower_limit",
                "usergroup_id"
              ],
              "key": "usergroup",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "gaseus.products_categories.product_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 1,
              "filtered": "99.97",
              "using_index": true,
              "cost_info": {
                "read_cost": "0.50",
                "eval_cost": "0.20",
                "prefix_cost": "25.82",
                "data_read_per_join": "47"
              },
              "used_columns": [
                "product_id",
                "lower_limit",
                "usergroup_id"
              ],
              "attached_condition": "((`gaseus`.`prices`.`lower_limit` = 1) and (`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": [
                "gaseus.products_categories.product_id",
                "const",
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 1,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.58",
                "eval_cost": "0.20",
                "prefix_cost": "26.60",
                "data_read_per_join": "7K"
              },
              "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": [
                "gaseus.products_categories.product_id",
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 1,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.99",
                "eval_cost": "0.20",
                "prefix_cost": "27.79",
                "data_read_per_join": "9K"
              },
              "used_columns": [
                "product_id",
                "lang_code",
                "product"
              ]
            }
          }
        ]
      }
    }
  }
}

Result

product_id	product	company_name	product_type
1154	Cylinder regulator F10 Effect	Gaseus	P
3315	Cylinder regulator F10/2 NP	Gaseus	P
3318	Cylinder regulator F10/200 Standard	Gaseus	P
3687	Cylinder regulator F15	Gaseus	P
5076	Cylinder regulator F15 Effect	Gaseus	P
4691	Cylinder regulator F20 Effect	Gaseus	P
3071	Cylinder regulator F40 Effect	Gaseus	P
513	Cylinder regulator F60	Gaseus	P
3505	Cylinder regulator F60 Effect	Gaseus	P
3319	Cylinder regulator nitrous oxide (N2O) 0-1,5 bar Vulkan F15/2 100 Effect	Gaseus	P
3306	Cylinder regulator SF6 (sulfur hexafluoride) 0-1,5 bar Vulkan F15/40 Effect	Gaseus	P
3296	Cylinder regulator SF6 (sulfur hexafluoride) 0-20 bar Vulkan F20/40 Effect	Gaseus	P
1172	Cylinder regulator Vulkan F20/2 300 Effect oxygen DIN477-5, 0 - 20 bar	Gaseus	P
1173	Cylinder regulator Vulkan F20/2 300 Effect oxygen DIN477-5, 0 - 20 bar	Gaseus	P
4917	Cylinder regulator Vulkan F20/2 300 Effect oxygen DIN477-5, 0 - 20 bar	Gaseus	P
4918	Cylinder regulator Vulkan F20/2 300 Effect oxygen DIN477-5, 0 - 20 bar	Gaseus	P
6962	Linde Automatic manifold 300 bar FBA/BBA-21-AUM-300-15-75-H2/FG - EX	Gaseus	P
6966	Linde Automatic manifold 300 bar FBA/BBA-21-AUM-300-15-75-O2	Gaseus 2 test	P
6967	Linde Automatic manifold 300 bar FBA/BBA-21-AUM-300-20-160-O2	Gaseus	P
6965	Linde Automatic manifold 300 bar FBA/BBA-21-AUM-300-25-125-O2	Gaseus	P
6963	Linde Automatic manifold 300 bar FBA/BBA-21-AUM-300-40-125-N2/DL	Gaseus	P
6952	Linde Base module 1x1 FBA/BBA-11-M-300 O2	Gaseus	P
6953	Linde Base module 2x1 FBA/BBA-21-M-300 O2	Gaseus	P
6947	Linde HP-Bundle hose DN6/PS300,ÜM W21,8RH90°-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
6958	Linde Manifold FBA/BBA-21-AU-300-28-125-O2	Gaseus	P
6960	Linde Manifold FBA/BBA-21-AU-300-28-250-O2	Gaseus	P
6968	Linde Manifold FBA/BBA-21-AUM-300-25-250-O2	Gaseus	P
6961	Linde Manifold FBA/BBA-21-AUM-300-40-125-H2/FG	Gaseus	P
6964	Linde Manifold FBA/BBA-21-AUM-300-40-250-N2/DL/He	Gaseus	P
6957	Linde Manifold module SMB 1x1 for bundles, left side	Gaseus	P
6956	Linde Manifold module SMB 1x1 for bundles, right side	Gaseus	P
6954	Linde Manifold module SMF 1x1 for one cyr, right side	Gaseus	P
6955	Linde Manifold module SMF 1x1 for single cyr, left side	Gaseus	P
3500	Linde Manifold regulator H40/300 Effect	Gaseus	P
3501	Linde Manifold Regulator HR 40/300 HDR-300-40-250-O2 for FBA/BBA	Gaseus	P
3431	Linde Manifold regulator acetylene H20 0-1,5 bar 20 Nm3/h	Gaseus	P
6948	Linde Manifold regulator H20/100 Effect	Gaseus	P
3499	Linde Manifold regulator HDR-300-10-90-MISON für FBA/BBA	Gaseus	P
3455	Linde Pressure regulator F10/200 Effect, Biogon N	Gaseus	P
3466	Linde Pressure regulator F10/200 Effect, Biogon OC25	Gaseus	P
3454	Linde Pressure regulator F10/200 ´Biogon AC´ and ´Biogon C´	Gaseus	P