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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '2d96e96833efb40323876a40e6682bac4a571b90aa46da53cd6aee8469f54140' 
  AND token = 'XDBHH5B03DTgo8cMln2kC+NKFgqM/3lFYK+AVoG91x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00770

JSON explain

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