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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55724a8991e73d7456330e8722dc3e9123faf21e94122c5559905de7b401f36' 
  AND token = 'AxibLrJ64e1Nin00Pyt7d+zfRDefbfm/ysciMxCri6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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