Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bded97d1c82e5e9a220f3faa6f9528d78e9d666b167a5f360f6359b5edeea357' 
  AND token = 'K1N4o1CP430069rkKqnHT2OQsx/cBcOuS/UqeO6vcTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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