Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d39acb0b2100330775427100f7ff132b8bc83e44bfe87bef5650fc872ebf15c' 
  AND token = 'ifDy5s5H38w8Ygz07Qcj+YndHe1SSs7rvaitljoWaDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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