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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 (
    1837, 1820, 1304, 1738, 1893, 1895, 1894, 
    1641, 56, 1500, 1317, 1670, 1658, 1558, 
    1644, 1262, 1552, 1398, 1595, 1576, 
    1870, 1691, 1776, 1785, 1633, 1563, 
    1564, 1667, 1786, 1945, 1910, 1787, 
    1308, 1642, 1772, 1736, 1277, 1672, 
    1325, 1166, 1665, 1778, 1775, 1671, 
    1649, 1909, 1948, 1612
  )

Query time 0.00056

JSON explain

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