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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '9a87dc785bdf50aa56e4387ae8ea17e69d51cd856851f9d80356ffd268edc60d' 
  AND token = 'unLtE5KQqWg7DPXDJPWj5eTHAFYgsD/I9K3Gvs+NctY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01499

JSON explain

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