SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    418646, 460526, 456268, 423290, 443518, 
    408831, 443425, 432348, 458098, 422838, 
    459826, 400995
  )

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.0216566,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_products",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "loops": 1,
          "rows": 12,
          "cost": 0.0216566,
          "filtered": 100,
          "attached_condition": "cscart_products.product_id in (418646,460526,456268,423290,443518,408831,443425,432348,458098,422838,459826,400995)"
        }
      }
    ]
  }
}