Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ee4ba333f25f0d85cf00ca4345a29c16f6fd7862ca54f1e478e9e11fc600c4' 
  AND token = 'RGx4YlIASbCAYl9KK7EUtvAlnS23tbR3wOxpC0TtBec=' 
  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"
    }
  }
}