Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '354c3c61fa7b98cee533ca5af4d5d0abd5f8b6ef554bcc481e4d2ca2c33797ba' 
  AND token = 'DJQxGEnfwTL6EfavtRwJofvAfxQJ4k6rWuHrtMFwOqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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