Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80dd230dcb8f657a7f47e6d19b202769a657ccb281ec17dd5bee05c3260ab1dd' 
  AND token = 'vXcHHHqaKGWIkWqRWqPoNgWrTk71Hpr2GlYq4b3VCHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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