Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd12f9afca821249d334251c84da43ac7e444ba798915bf11cc9e05491a784344' 
  AND token = 'E1u1+/LitxBGl6+FPeow6ZlW+Tk0r3JRRuPvZ+G36mI=' 
  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"
    }
  }
}