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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a170e9aa5384ed24ac8ae6cb1ac6f3c8ae2e3211a4f849b9387c9e1c03fccb4' 
  AND token = '41QCW0CQ1r+I/TbWXcXfwDm9WXh/G6pk0w/DRwNrgIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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