SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7e747d42b915b0a6949a72c24d39c621175532037ed77189b166a3c5f68165' 
  AND token = 'RzZBYEmys4hwQLRh6pJwJqVn1EpkUdbmMtrxjLvR1II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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