Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd2a5f6563c5a2003f88449573ac14866b514480353ea3aa2dc7b36b72f1881' 
  AND token = 'BPDQNGR/XyTSs3lSrnG9wtg+P14orxKiV6sc0cvm98U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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