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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23829e4792f9d7f097330b04ef94afe0611cf727ef790382f249d757a016ce82' 
  AND token = '5VAtY+pixo91a2xxVa+wctR+7JQPx0Y9fh2KFgdIm3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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