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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 (
    71200, 71013, 70292, 70814, 71176, 71156, 
    71155, 71154, 71153, 70919, 71125, 
    71078, 71113, 70994, 70541, 71108, 
    71015, 70830, 71012, 70827, 71064, 
    71062, 71061, 71011, 70545, 70544, 
    70122, 70813, 70817, 70952, 70947, 
    70540, 70359, 70882, 70881, 70829, 
    70828, 70538, 70230, 70229
  )

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