Sandbox

SELECT 
  SQL_CALC_FOUND_ROWS products.product_id, 
  products.amount, 
  IF(
    shared_descr.product_id IS NOT NULL, 
    shared_descr.product, descr1.product
  ) as product, 
  companies.company as company_name, 
  variation_group_products.group_id AS variation_group_id, 
  products.product_type, 
  products.parent_product_id, 
  products.free_shipping, 
  products.product_label_id, 
  products.product_label_id_by_admin, 
  categories.id_path 
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_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' 
  INNER JOIN cscart_product_variation_group_products AS variation_group_products ON variation_group_products.product_id = products.product_id 
  LEFT JOIN cscart_categories as categories ON categories.category_id = products_categories.category_id 
  LEFT JOIN cscart_product_label as product_label ON product_label.id = products.product_label_id_by_admin 
WHERE 
  1 
  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 variation_group_products.group_id IN (10) 
GROUP BY 
  products.product_id 
ORDER BY 
  NULL asc

Query time 0.00087

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	companies	system	PRIMARY				1	Using temporary
1	SIMPLE	variation_group_products	ref	PRIMARY,idx_group_id	idx_group_id	3	const	7
1	SIMPLE	products	eq_ref	PRIMARY,status	PRIMARY	3	cscart_dev_4_16.variation_group_products.product_id	1	Using where
1	SIMPLE	shared_descr	eq_ref	PRIMARY,product_id,company_id	PRIMARY	13	cscart_dev_4_16.variation_group_products.product_id,const,const	1	Using where
1	SIMPLE	products_categories	ref	PRIMARY,pt	pt	3	cscart_dev_4_16.variation_group_products.product_id	1
1	SIMPLE	cscart_categories	eq_ref	PRIMARY,c_status,p_category_id	PRIMARY	3	cscart_dev_4_16.products_categories.category_id	1	Using where
1	SIMPLE	categories	eq_ref	PRIMARY,p_category_id	PRIMARY	3	cscart_dev_4_16.products_categories.category_id	1
1	SIMPLE	descr1	eq_ref	PRIMARY,product_id	PRIMARY	9	cscart_dev_4_16.variation_group_products.product_id,const	1	Using where

Result

product_id	amount	product	company_name	variation_group_id	product_type	parent_product_id	free_shipping	id_path
278	82	T-shirt, Color: White	CS-Cart	10	P	0	N	223/224
279	90	T-shirt, Color: White	CS-Cart	10	V	278	N	223/224
280	83	T-shirt, Color: Black	CS-Cart	10	P	0	N	223/224
281	0	T-shirt, Color: Black	CS-Cart	10	V	280	N	223/224
282	79	T-shirt, Color: Blue	CS-Cart	10	P	0	N	223/224
284	0	T-shirt, Color: Blue	CS-Cart	10	V	282	N	223/224
283	0	T-shirt, Color: Blue	CS-Cart	10	V	282	N	223/224