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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 (
    31436, 31435, 31434, 31433, 31432, 31431, 
    31430, 31429, 31428, 31427, 31426, 
    31425, 31424, 31423, 14017, 13990, 
    13989, 13968, 13987, 13986, 13985, 
    13983, 13982, 13981, 13980, 13979, 
    13978, 13977, 13976, 13975, 13974, 
    13973, 13972, 13971, 13970, 13969, 
    16527, 13892, 13891, 13882
  )

Query time 0.00020

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