Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6261955b8c94f049efae6cc9194268746c3542500defdf5c2413fb0a48e0de1c' 
  AND token = 'Vd6Q2CvO1DR6qVsqh0ECfP8fsdE/i6N6alhv0+hugzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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