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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'dd6cb53c9aaa1b25ddec2f19c7aa091b1d556d47a4856632ccefe6ccab773dd4' 
  AND token = 'A3E9Rb/LZkwSBUlHwPtJ5qX6HSrV+9uLmH9gHL3G7UU=' 
  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"
    }
  }
}