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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 (
    1401, 1402, 1403, 1384, 727, 729, 726, 
    1583, 251, 237, 238, 373, 372, 339, 365, 
    236, 786, 381, 389, 1914, 1321, 1368, 
    1877, 1876, 1878, 1806, 1794, 1807, 
    1884, 1886, 1889, 1890, 1881, 1879, 
    1880, 1882, 1888, 1871, 1887, 715, 714, 
    1485, 1915, 345, 1451, 1183, 18, 17, 
    19, 1814, 1813, 1874, 1875, 974, 1574, 
    1575, 1812, 1811, 1507, 1853, 1856, 
    1918, 1919, 1862, 1861, 1857, 1883, 
    1860, 1859, 1854, 1923, 1858, 1922, 
    1855, 1920, 1469, 344, 1850, 1551, 284, 
    1475, 1276, 1569, 1198, 1179, 1281, 
    926, 1258, 1168, 1394, 1259, 1865, 390, 
    1204, 1864, 1863
  )

Query time 0.00089

JSON explain

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