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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'abc598725ef2f8a06ea980878b6608c6ce4e4e319585c0e275ea70fe1f17aea4' 
  AND token = 'CC4jMSMjxYhynTMd4tiM9OPOhs6oIrBr37MZnABi2uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00763

JSON explain

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