Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c818dbe20948568c43a1f62b0cf9be7046ca3e78e9be06ce10470cf699cff381' 
  AND token = '9153Ql/xE/tBw7tceqSrSV4HtnabsXKTzImKzBQLS+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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