Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '822de3dddd7eccd00a77848520a4e24278335b5c3b8002772dd8d49bfe9f9bc2' 
  AND token = 'AWXzgZTIji8XK3ppyc0HbTxp7W/uGJIDRcFmiu0UR6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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