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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '915c28f7b001c3145e6b6ae504d724977af44948e01d345704eb07d817e0f68c' 
  AND token = 'Z6nuQISnLpJeNsr27itBJfbmoy1wbMz7u/kO3YkGcEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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