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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'e6031a162b3b02b72c48eb48b8bb098c257e36a6a2c58da7e4a183281f632f09' 
  AND token = '5lnWCy4zIpEdLJBB4sBsAtcIcKo6+q6lWsW+7wyq3GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01130

JSON explain

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