SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b957636d64794a03b8380723e8353c37fb9992d6650b5fad84736d805ecf3f5f' 
  AND token = '9eVOzydFz9JX/4bRcZJl2lG/0IKBegDwNpEjB0D2bJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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