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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eacaacf0f04afe0353e5dc04f6b2a4558f6841e8cab6005fe68f64a15204f5f' 
  AND token = 'RqK2j3P/zNT6oV51EjgTsfc+0GQgymBqqPD2uyPizzA=' 
  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"
    }
  }
}