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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f180ebef92c6944a83c2741a96f1cd935405171cc0bd0664988a69598e31e98' 
  AND token = '/ztWHbFXhyDdwkX/Its/zozQY5/p6VxRO8UiVFxQXUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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