SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05e840b1c719fbe4efc4ad89a515fdf4079ef725db170762739edd54224df362' 
  AND token = 'Glus6pgu/VXUQDiBzWRVRVdZkLy4hUmA4BqVYs+Lqfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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