SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b29982fdae4173a9205c4401b9fb7e10003a59a217d66929f1d16e64f5b61d4b' 
  AND token = 'vZuDm4hJ2T2IGFWBS83xPUcHfmFnix3Kz+pziw7iV8s=' 
  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"
    }
  }
}