SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    31639, 31640, 31642, 31641, 31643, 31652, 
    31651, 31649, 31650, 31647, 31645, 
    31646, 31644
  )

Query time 0.00147

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_products",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "rows": 13,
          "filtered": 100,
          "index_condition": "cscart_products.product_id in (31639,31640,31642,31641,31643,31652,31651,31649,31650,31647,31645,31646,31644)"
        }
      }
    ]
  }
}