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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 (
    84954, 84953, 84952, 84950, 84948, 84906, 
    84905, 84904, 84903, 84902, 84901, 
    84900, 84899, 84898, 84897, 84896, 
    84895, 84628, 84627, 84600, 84599, 
    84597, 84943, 84942, 84919, 84918, 
    84917, 84916, 84915, 84639, 84549, 
    84977, 84811, 84810, 84809, 84808, 
    84807, 84806, 84805, 84804
  )

Query time 0.00021

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