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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '87b1cd24f205e5b50d4d020913958b3e505dacc0fc47fe23374ad8c123ae0081' 
  AND token = 'LbkVSNidyBkRsuToZuPhaiyVtziKnfdFnQd64v4shVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00752

JSON explain

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