SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd727b7c3b207fb1e1de650b822ee92fdd9afa964b163b48ff73d5c483afb665a' 
  AND token = 'CKCNcMZcS9jbM4zd5/fksoDp8xW+ImUlZYIRh5NgGIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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