SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    417156, 412957, 447950, 452843, 421121, 
    421884, 451854, 423912, 449116, 421546, 
    415507, 439646
  )

Query time 0.00054

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 (417156,412957,447950,452843,421121,421884,451854,423912,449116,421546,415507,439646)"
        }
      }
    ]
  }
}