SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907286bcf421171ec7364133283d804f8c0c6b265f1cbb33480ed20b8d24da24' 
  AND token = 'CvmGigWEElWsvZqvkj9cq/xH6sSrHKTWWTFh7jPUhmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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