Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd89a5493a7872c5dc6d68675a42c98df4475ccdce34a3b037c9d5ca31b4d8c0e' 
  AND token = '3XVdv28H8PBb7tyN1sOHeaSdoCNcThgikKoEl4kppIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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