SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '738aa48cd7b6c8e09169d65b53a93cd5b9fd1e4d28e3fa88a6959ea14a7e527c' 
  AND token = 'MYWVIELyFinWW2YCtHujZuAqpPh+Hmk4cwmUvlaeb/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00896

JSON explain

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