Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8003efc1fce07483dc50f67728f10df1ed7e368c418edd23eecfc858b3ceb285' 
  AND token = '2ncJ8qgrGI6v3CdE67+DXCyufXElc9wD1QJDs5t7Gmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}