Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c278a015aba70ea23da6bf00d8c7d47578a7dd903b2194f9421c4adbcfe6f304' 
  AND token = 'KMPcdObF3G7t2LUOnQV89QGpmYipXPM4T1l9wBjzapQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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