SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    402856, 425249, 426807, 436732, 406919, 
    429651, 457920, 446530, 411604, 432652, 
    459363, 412904
  )

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.0216566,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_products",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "loops": 1,
          "rows": 12,
          "cost": 0.0216566,
          "filtered": 100,
          "attached_condition": "cscart_products.product_id in (402856,425249,426807,436732,406919,429651,457920,446530,411604,432652,459363,412904)"
        }
      }
    ]
  }
}