SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984c06ae044cc8b93f3616a8f03c6a1e7f2970706878a5c76451d70e00d703eb' 
  AND token = 'Yv89QZQCKgHQXDRk9UkYTvzC/uSTFLVpx7vVMjfwKQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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