Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0d79505ca4a24e5a90abe4e00b3a993481ad811e2be25d061005e69a8f7218' 
  AND token = 'MhKdCOEwJizho1ZYhhWwF/LUsf6T9yofGRt8CM9OhgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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