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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '5f892f968b75995a79ed81723f9ae3f54b3170851e6fa67db6bb6f30bbfc2d67' 
  AND token = 'UEkJqv+YFgfRcHLnSfY9ny8WiSuiIXyXnnhBxFEF8Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00852

JSON explain

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