SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2de782c25ab99405b04462e855216d1fe65d1a913ca915801ffb786fb606b37' 
  AND token = 'tTpVys9RHuccU+U1hhUAjatqFQGaPCJ6vgoSzyT7z9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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