SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf24c8ed350a3149b042f239e319f8bf15c64c83c005d279a877fe2a9f554976' 
  AND token = 'hshxvzt0ZfFH4533UMosRg2S5YkmoI6vSk+w0TDgqK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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