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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bfbbb77bf400080c37b76b1e265ddaae4d6803adb68e97d5a416d1f577c1d94' 
  AND token = '5xfo4/A86Y/hJ+FSFGSuaKir/XyQ0U+RHJUXx2srn/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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