Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e452f1bdc3b49d015681d9b795a797b6d2b9d076924a900b4c118cc82020661' 
  AND token = 'OxoSUqhjqTFCNHJUVcBYA2Hbm9gTSuFPiznnMJ0az6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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