SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    10833, 10834, 10835, 10836, 10837, 10838, 
    10839, 10596, 10597, 10598, 10599, 
    10600, 10521, 10520, 10519, 10518
  )

Query time 0.00100

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": 16,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (10833,10834,10835,10836,10837,10838,10839,10596,10597,10598,10599,10600,10521,10520,10519,10518)"
    }
  }
}