Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29272e76ab7f41ce92d9b3777ef3b81ede4f570e34f2156dba763177bb80c666' 
  AND token = 'IsHeQTFSxAAxKda4LGUZyz4IdPs0D5ItI9P8/5Srdac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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