SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    112217, 312426, 312427, 312428, 312429, 
    312430, 312431, 312432, 312433
  )

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.01644023,
    "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": 9,
          "cost": 0.01644023,
          "filtered": 100,
          "attached_condition": "cscart_products.product_id in (112217,312426,312427,312428,312429,312430,312431,312432,312433)"
        }
      }
    ]
  }
}