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 (
    38067, 38037, 38036, 38034, 38033, 38032, 
    38031, 38030, 38029, 38028, 38027, 
    38026, 38025, 38022, 38021, 38020, 
    38019, 38018, 38017, 38016, 38015, 
    38014, 38013, 38012, 38011, 38010, 
    38009, 38008, 38007, 38006, 38005, 
    38004, 38003, 38002, 38001, 38000, 
    37999, 37998, 37997, 37996, 37995, 
    37994, 37993, 37992, 37991, 37990, 
    37989, 40283, 38872, 38159, 79896, 
    38226, 38078, 38077, 38076, 37988, 
    37987, 37986, 38458, 38423, 38422, 
    38421, 38420, 38419, 38418, 38417, 
    38400, 38399, 38244, 38227, 38172, 
    37985, 40512, 38181, 38180, 40355, 
    38884, 38062, 38043, 38042
  )

Query time 0.00068

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE f ALL idx_group_id 46
1 SIMPLE g eq_ref PRIMARY PRIMARY 3 toolboxdigitalshop_dev.f.group_id 1
1 SIMPLE p ref PRIMARY,idx_group_id idx_group_id 3 toolboxdigitalshop_dev.f.group_id 16 Using where