Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b0aee953190221954a24b71b45e1213f91e9ecf9626c6c713987e07173e2524' 
  AND token = '+n10M7yzFXiLS/2ndE1qmhpJfReq7h6TswbbuHiPc24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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