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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'fed85681c5c88c3ce272c61f12dae998adca99c45c3b6382edef3cda7364f29f' 
  AND token = 'RhH+h8TFVEtRdYIK0vbffrVICxF0E9Fa2Am4lkGkNYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00745

JSON explain

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