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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '03a54a678a64b0903e310945414e64dc80f7faa7f54ab3ce97ff25589df0368c' 
  AND token = 'mbNy/Hxu9YX2ZCAXTDSWKS7iwM+DSdSQnfOxQ2DfGDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01491

JSON explain

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