Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e16a509e365a022adfe3e4e2a2ee257f867c538b6dccef624161cd5e677691' 
  AND token = 'ydELx0qFTk7Bf7IHDuPve5oHvooLb2HNkXZr2+9KobY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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