Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de1bc2bf48c28c8b60e0188730a40cdddfd81b2d293fdda36871e307418c2009' 
  AND token = 'O+KQGBwjXyfdiUD/9fl+kc0LAR9KP7fFl5ctv+NMYcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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