SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2a9f8136145ed4cc27c5dd389229861157822ec3221ffef04bbb788d065672f' 
  AND token = 'ksuJgBgLDvJfTUVixkUy4IpYvQIMhPH6gWrifSGQSSo=' 
  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"
    }
  }
}