SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64e4bc5532c019278fa069798a4d252992cd98d5b10bfab7778c859f96366885' 
  AND token = 'YjdFjeZmt/U3ixZNlXKCIX+29h3OqurRGdMk1lDs40A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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