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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '118954e2d49ef58ec1110281e48e247710c75fd7ae5e93e182960bd943aa7992' 
  AND token = 'nZa+Dp+r7tdjCNGm62E3yvXYHYJU1qSKWKOzyRwoRGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00899

JSON explain

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