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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '95d3b7775ff87eea6b8bcd2e38acfe56ecc5604f71729298630f86d1a5094496' 
  AND token = '3kry4TZm22JPnL2ZcQNlfxKfQEZe4HMFv6V57SHgzsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00789

JSON explain

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