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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11cd6bd49f8620ea8f5ec8e76765cef8b6c1f16abcf38e289c6bbb698d8917ab' 
  AND token = 'm8s6U4hQXszau26r3anZ4nTXumIbGgz6Ll3S2pemm1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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