SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d69979427986a3049c01dc783d1f33ca5b28ab8955311335689a1b9bdd53942' 
  AND token = '4NLyZb/ac7rYzj+nLfVvhg46LOjiUNMCoS9V8oKvreU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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