Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc6615e6fed7c9855341b9ab6c956b8d2d3ef7b93cd96143631f1b68202c0940' 
  AND token = 'Z715b+Mokk1SHfqTKT0495jJKwWRmt/e2EHXJAZW7AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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