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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '7b6a1cd0a08fb4091db837581a7f9bf9dfcc74542b4bca4ed67d4e177b4006ec' 
  AND token = 'xXzzlcTYK/feTkEsZzIFWfSCOx4eOCafTTtEUCp+X3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00752

JSON explain

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