SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bdbde15c2de7c217967622f68ab4dd9b7f0bed1089a23b165636a675e8fc122' 
  AND token = 'UPzZj/r2+UAf14pnN8ZMEisY/KwHqLoxrU7hRghy5+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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