SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9bbe9f07bdf2f93df9e2263450804ca7b3c5dcc48c867f62dc0d56dab5411f' 
  AND token = 'q/dgGBESfFFrOZhcTfthgdHPsNzqC9BH0W+x38sMHvI=' 
  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"
    }
  }
}