Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f7b56412846bf20b6a24d337d687cc3dbae610014c9e3d9cf97296195f28ce3' 
  AND token = '9LFLvuhLm6mvngSON0P1lTUkqxiXMfClgsrFhEp0Xls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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