Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4674a4df0bee90ca88a94aa830d02aeafe979ee541a78f9d10a087a5511d6f16' 
  AND token = 'DcAvt6QBgz5DU+GFnkOK6R68xgK8eMhKg5U4WO2PtFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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