SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c30b54c765ab321c2222c47ebd9d813e99917fa3aaec6e6ecf1d3587471160c' 
  AND token = 'p1GRVfSGhqk/28uQxALxKgBKAQU8sa4BUBkXE7j/WH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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