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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'e5fd4da4001b6c86d22d663d41bde67c4dc8bd5c23016469ed348221cb626cd2' 
  AND token = 'SNRPI+Molkf8MxsSgJuE1AxjooVgUXS7j+NL3ham2zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00755

JSON explain

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