SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9148379286684e34b1e4f4baf746e1c8c6fb0863f2bcd4b5fc4c427320fd11fc' 
  AND token = 'GugUzh0PF9ejsrhONqrUkwIjFZ+Ibpwx5P48F1nW9mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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