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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 (
    14819, 14818, 39047, 14808, 14807, 23244, 
    23237, 14795, 14720, 14713, 14730, 
    14728, 14726, 14723, 14722, 14787, 
    14701, 76378, 76377, 14677, 14663, 
    14662, 14661, 14660, 14659, 14658, 
    14657, 14656, 14654, 14653, 14652, 
    14651, 14649, 14648, 14647, 14646, 
    14645, 14644, 14643, 14642
  )

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