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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '1f26fbc8733b61ce0a3e42c189ec9c622b78b633598c4b1d5bc87da3ed21cab0' 
  AND token = 'bVKW+J1Ndt1LDc37IHlNRzO3FQM3rShr8kY4CKy8IXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00739

JSON explain

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