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SELECT 
  f.feature_id, 
  f.purpose, 
  p.product_id, 
  p.parent_product_id, 
  g.id, 
  g.code 
FROM 
  cscart_product_variation_group_features AS f 
  INNER JOIN cscart_product_variation_groups AS g ON f.group_id = g.id 
  INNER JOIN cscart_product_variation_group_products AS p ON f.group_id = p.group_id 
WHERE 
  p.product_id IN (
    87015, 87014, 87918, 87917, 87916, 87915, 
    87914, 87913, 87912, 87911, 87910, 
    87909, 87908, 87907, 87906, 87905, 
    87904, 87903, 87902, 87901, 87900, 
    87899, 87898, 87897, 87896, 87848, 
    87847, 87846, 87845, 87844, 87843, 
    87842, 87841, 87840, 87839, 87838, 
    87837, 87836, 87835, 87834
  )

Query time 0.00024

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	p	ALL	PRIMARY,idx_group_id				376	Using where
1	SIMPLE	g	eq_ref	PRIMARY	PRIMARY	3	toolboxdigitalshop_dev.p.group_id	1
1	SIMPLE	f	ref	idx_group_id	idx_group_id	3	toolboxdigitalshop_dev.p.group_id	7