Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82729e37f77f3b1eb104ea1ad0d2c8e1c6d9a1752dcecc569337a9a1bffe1603' 
  AND token = 'AEMNraKw2PGdzssevbWChKEs3SY5whbmleBPelwNMHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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