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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e9155675f151b31fa88cc313230232b037b3b56f7a5508032e33269ea973bbb' 
  AND token = 'eNPKBTPZ4Igpc1Ty2NEc2jCmsca/kSb5PtHKonjSIAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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