SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    13026, 13025, 13024, 13023, 13022, 13021, 
    13020, 13019, 13018, 13017, 13016, 
    13015, 13014, 13013, 13012, 13011, 
    13010, 13009, 13008, 13007
  )

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_products",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 20,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (13026,13025,13024,13023,13022,13021,13020,13019,13018,13017,13016,13015,13014,13013,13012,13011,13010,13009,13008,13007)"
    }
  }
}