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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 (
    878, 877, 879, 876, 870, 891, 869, 890, 
    871, 892, 277, 785, 784, 1081, 1079, 
    1080, 1078, 1082, 1083, 1077, 248, 919, 
    269, 821, 822, 278, 279, 302, 303, 720, 
    986, 921, 922, 920, 923, 960, 674, 679, 
    948, 678, 526, 677, 680, 527, 959, 676, 
    675, 896, 881, 894, 882, 895, 893, 950, 
    957, 949, 956, 953, 954, 951, 952, 958, 
    1090, 955, 335, 334, 156, 336, 961, 965, 
    963, 964, 962, 966, 219, 270, 1302, 272, 
    273, 274, 973, 223, 222, 160, 194, 164, 
    174, 158, 183, 192, 188, 163, 172, 184, 
    173, 191
  )

Query time 0.00064

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}