SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89032b5857816e09dd7471e3e9fdca2f9065e648bd18ca78f203692b6db8d47e' 
  AND token = 'G/efviYNtjxmKQPMua3LxkYgr+9gu42BmVtDB22+4vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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