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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 (
    66793, 66792, 66791, 66790, 66789, 67007, 
    66714, 66711, 66706, 66704, 66697, 
    66696, 66692, 66725, 66721, 66312, 
    66282, 66281, 66662, 66619, 66618, 
    66617, 66616, 66615, 66614, 66613, 
    66612, 66611, 66610, 66609, 66608, 
    66526, 66206, 66205, 66204, 66203, 
    66202, 66201, 66200, 66199
  )

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