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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 (
    18481, 18505, 18506, 18483, 18501, 18507, 
    18523, 18508, 18509, 18510, 18511, 
    18512, 18484, 18513, 18514, 18485, 
    18486, 18487, 18488, 18515, 18516, 
    18517, 18518, 18496, 18519, 18489, 
    18490, 18520, 18521, 18493, 18491, 
    18492, 18522
  )

Query time 0.00045

JSON explain

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