Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0ec1c124fdb013d6649fe63fc0f8d9ca5c6aead589c9cab7225aee02df0a1ea' 
  AND token = 'HuIqH/xMSpW77il7hmxuSQ6iMow0uNS34JVtM9mZYjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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