Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '859b4ee260c5dd33607bc7e3065c8b94943ec06cbc38c36343b87397167f2c91' 
  AND token = 'PsatZakJ4KMh72YxdBnZ9TWTOo73hfm3iz2OrlRT83s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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