Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '333cc68e11840824c17ef9f8bd0c1f751dc2be7906e6862e919a6a2d272bb4bb' 
  AND token = 'ieEdiiKRNlqOGOdleZrgriHTm8oecMD0cV8iVv/E2FM=' 
  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"
    }
  }
}