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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '5b11b951d14dea13380b15370a70cd5556becf6de76bafb254709d79252558d6' 
  AND token = 'x/zbsGHXonGr8tHqegiqDVbhR45nkfqbU+DyQACbVRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00793

JSON explain

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