Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51aad4319dbed02a368ddc1cff0347f034c4dd51ffc8817413a27758baeb65ed' 
  AND token = '9ohii4WnNpNunjqlBnWtqKc84QTX2ezhZ9P9LkDEZLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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