SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf08047bd45ae2771a24b070b379aaa79ef033923fdf1935f9f686f56537c7b' 
  AND token = 'NWZ/jq+AKu9g6liTmEHBIQxScDjyr27p6TvI6PV0IG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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