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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '94a11ba75b126b16f146a814be9da2fe481fc52e2f415a5f0c47cd2dd10a8964' 
  AND token = '/NSYC0G3crzgPI6A48AdMkTb+ctF9MW/x6K5Dyr0sQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00798

JSON explain

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