Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e286a499302ee1f952520341308aa1274edc6d3b82abb7ea9ac47811cac14542' 
  AND token = '1UoklkTvhjbvJOuczzeCh5lRK3fAj6j3yxbfA2e5ZBk=' 
  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"
    }
  }
}