Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c351050e14b90d2256e08fb8c4869d6cf27652ad757d362fa02bab077b0dc41' 
  AND token = 'ovZcoheD1eyy0GfpToBzW6lA5BlbYtGs5zpj9+LM0S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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