SELECT 
  pf.feature_id, 
  pf.company_id, 
  pf.feature_type, 
  pf.parent_id, 
  pf.display_on_product, 
  pf.display_on_catalog, 
  pf.display_on_header, 
  cscart_product_features_descriptions.description, 
  cscart_product_features_descriptions.lang_code, 
  cscart_product_features_descriptions.prefix, 
  cscart_product_features_descriptions.suffix, 
  pf.categories_path, 
  cscart_product_features_descriptions.full_description, 
  pf.status, 
  pf.comparison, 
  pf.position, 
  groups.position AS group_position, 
  cscart_product_features_values.value, 
  cscart_product_features_values.variant_id, 
  cscart_product_features_values.value_int 
FROM 
  cscart_product_features AS pf 
  LEFT JOIN cscart_product_features AS groups ON pf.parent_id = groups.feature_id 
  LEFT JOIN cscart_product_features_descriptions ON cscart_product_features_descriptions.feature_id = pf.feature_id 
  AND cscart_product_features_descriptions.lang_code = 'en' 
  INNER JOIN cscart_product_features_values ON cscart_product_features_values.feature_id = pf.feature_id 
  AND cscart_product_features_values.product_id = 526 
  AND cscart_product_features_values.lang_code = 'en' 
  INNER JOIN cscart_ult_objects_sharing ON (
    cscart_ult_objects_sharing.share_object_id = pf.feature_id 
    AND cscart_ult_objects_sharing.share_company_id = 2 
    AND cscart_ult_objects_sharing.share_object_type = 'product_features'
  ) 
WHERE 
  1 
  AND pf.feature_type != 'G' 
  AND pf.status IN ('A') 
  AND pf.display_on_product = 'Y' 
  AND (
    pf.categories_path = '' 
    OR ISNULL(pf.categories_path) 
    OR FIND_IN_SET(261, pf.categories_path) 
    OR FIND_IN_SET(923, pf.categories_path) 
    OR FIND_IN_SET(949, pf.categories_path) 
    OR FIND_IN_SET(951, pf.categories_path) 
    OR FIND_IN_SET(954, pf.categories_path)
  ) 
GROUP BY 
  pf.feature_id 
ORDER BY 
  group_position, 
  pf.position, 
  cscart_product_features_descriptions.description

Query time 0.00133

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE cscart_product_features_values ref PRIMARY,fl,lang_code,product_id,fpl,product_id_idx,feature_id_idx,feature_value_product_idx,product_feature_idx product_feature_idx 3 const 74 Using where; Using temporary; Using filesort
1 SIMPLE pf eq_ref PRIMARY,status PRIMARY 3 mahm3t_cs443.cscart_product_features_values.feature_id 1 Using where
1 SIMPLE groups eq_ref PRIMARY PRIMARY 3 mahm3t_cs443.pf.parent_id 1
1 SIMPLE cscart_product_features_descriptions eq_ref PRIMARY PRIMARY 9 mahm3t_cs443.cscart_product_features_values.feature_id,const 1 Using where
1 SIMPLE cscart_ult_objects_sharing eq_ref PRIMARY PRIMARY 159 mahm3t_cs443.cscart_product_features_values.feature_id,const,const 1 Using where; Using index

Result

feature_id company_id feature_type parent_id display_on_product display_on_catalog display_on_header description lang_code prefix suffix categories_path full_description status comparison position group_position value variant_id value_int
22 1 M 18 Y Y Y Material en 354,355,356,362,368,438,449,452,555,556,770,771,783,787,789,790,261,357,359,360,365,367,369,459,461,468,472,475,484,485,486,487,797,799,805,808,813,814,817,820,831,842,843,844,848,849,850,890,891,437 A N 5 0 99
23 1 M 18 Y Y Y Opening en 354,355,356,362,368,438,449,452,555,556,770,771,783,787,789,790,261,357,359,360,365,367,369,459,461,468,472,475,484,485,486,487,797,799,805,808,813,814,817,820,831,842,843,844,848,849,850,890,891,437 A N 10 0 6273
21 1 S 18 Y Y Y Glazing en 354,355,356,362,368,438,449,452,555,556,770,771,783,787,789,790,261,357,359,360,365,367,369,459,461,468,472,475,484,485,486,487,797,799,805,808,813,814,817,820,831,842,843,844,848,849,850,890,891,437 A N 20 0 96
20 1 N 18 Y Y Y Window U-value en W/m²K 354,355,356,362,368,438,449,452,555,556,770,771,783,787,789,790,261,357,359,360,365,367,369,459,461,468,472,475,484,485,486,487,797,799,805,808,813,814,817,820,831,842,843,844,848,849,850,890,891,437 A N 30 0 6058 1.100
19 1 N 18 Y Y Y Glazing U-value en W/m²K 354,355,356,362,368,438,449,452,555,556,770,771,783,787,789,790,261,357,359,360,365,367,369,459,461,468,472,475,484,485,486,487,797,799,805,808,813,814,817,820,831,842,843,844,848,849,850,890,891,437 A N 50 0 92 0.800
24 1 S 18 Y Y N Control en 354,355,356,362,368,438,449,452,555,556,770,771,783,787,789,790,261,357,359,360,365,367,369,459,461,468,472,475,484,485,486,487,797,799,805,808,813,814,817,820,831,842,843,844,848,849,850,890,891,437 A N 100 0 107