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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 = 'fr' 
  INNER JOIN cscart_product_features_values ON cscart_product_features_values.feature_id = pf.feature_id 
  AND cscart_product_features_values.product_id = 606 
  AND cscart_product_features_values.lang_code = 'fr' 
  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 = 3 
    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(739, pf.categories_path) 
    OR FIND_IN_SET(755, pf.categories_path) 
    OR FIND_IN_SET(775, 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	33	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	suffix	categories_path	status	comparison	position	group_position	value_int
33	1	O	31	Y	Y	N	Largeur	fr	mm		A	N	10	10	1500.000
32	1	O	31	Y	Y	N	Longueur	fr	mm		A	N	20	10	50000.000
46	1	O	118	Y	Y	N	Grammage	fr	g/m²	375,382,442,454,775,792	A	N	10	90	190.000
121	1	O	118	Y	Y	N	Épaisseur	fr	μm	375,382,442,454,775,792	A	N	20	90	750.000
122	1	O	118	Y	Y	N	Facteur de diffusion de la vapeur d'eau	fr	m	375,382,442,454,775,792	A	N	30	90	0.020