SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16c179d7fb135d2e59cc8f9432de2634574b354387790216d369e60c3c3ba59f' 
  AND token = 'VA2WpFzgGtmIwqrgYa6Bvo76nuDxPnQhuABxBm0y+pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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