SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06722389ab53a6e652caeb94953006513e5ee7ed17976075e9bf198fdd06dde3' 
  AND token = 'vSp8zEFxo/5usPOxazKhj8WBj/AwIQTpVC6YioTp/2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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