SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb467675f3dd2609eb98d260b3579cdcb42db6420dfdaef2ab2240d74e8c6d18' 
  AND token = 'I7ugRC5akR/3sO+B+KhwUgGZBgud/QTo7LyM0yyHJ/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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