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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '1863c43ea01dc4b964f7dbbd3cb4c95ea95c6088704a8a47639a98a72d14a34f' 
  AND token = '5pr/Bm/jDYfkvREyHzl5dBLCFeLpPa4xopzmOSOwHpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00792

JSON explain

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