SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb282a32a109057873e78a488c25f21636c81f48dd2fba618ec0fa4095de779' 
  AND token = 'RvBCj6Unlohpz9NpjYu810UzRDGKOfwsSadY/nH7SjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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