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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '56e7fea054413578164af779e20164088c802bfae60c2544a8018b69d2e58c5e' 
  AND token = '/2hsnGg2ALLsYM0D6DFN4jneOkTKWoIv7fHqaWwG9eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01052

JSON explain

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