SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    16664, 16665, 16666, 16667, 16668, 16669, 
    16670, 16671, 16672, 16673, 16674, 
    16675, 16676, 16677, 16678, 16679, 
    16680, 16697
  )

Query time 0.00153

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": 18,
          "filtered": 100,
          "index_condition": "cscart_products.product_id in (16664,16665,16666,16667,16668,16669,16670,16671,16672,16673,16674,16675,16676,16677,16678,16679,16680,16697)"
        }
      }
    ]
  }
}