SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6128681730c28371dabee15e26128967f7f95bf594c7cc0ca528361cba08eefe' 
  AND token = 'isyY0C8VBMRlmD/gVayPrNUFdGvpeKrJKorHjGcKZuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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