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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a738a67e7ad32b8a1f29d3fe698aaa248d70d7b9d42d49cbc5adb726f084bc' 
  AND token = 'TkiePnoH7Rg2Kr9aHO5UtkNrXieLpt9K7dmGekNMWlg=' 
  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"
    }
  }
}