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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 (
    89591, 89586, 89585, 89584, 89583, 89121, 
    89120, 89119, 89118, 89117, 89116, 
    89089, 89088, 89087, 89695, 89549, 
    89548, 89547, 89482, 89283, 89097, 
    89096, 89095, 89094, 89093, 89091, 
    89050, 89049, 89048, 89508, 89507, 
    89506, 89505, 89504, 89025, 89024, 
    89023, 89022, 89021, 89020
  )

Query time 0.00027

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