SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    27361, 6357, 27359, 27357, 27363, 41436, 
    6367, 5769, 41445, 43852, 5771, 5773, 
    5768, 6544, 41431, 2042
  )

Query time 0.00142

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": 16,
          "filtered": 100,
          "index_condition": "cscart_products.product_id in (27361,6357,27359,27357,27363,41436,6367,5769,41445,43852,5771,5773,5768,6544,41431,2042)"
        }
      }
    ]
  }
}