Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a332c35041846492b230147f3e3225702eee61f9c46fca89f0bda153db6c82' 
  AND token = 'T2g7ranty8AgiV9ifZgDMqMD97rPx6VTNJNvjlMTij8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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