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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce20b44dade2037065cb0c10b40c01f367192d579b09df0c08fe5bf3b061bd1' 
  AND token = '4mN1jFJPN+ejZiu/qCAcKV4YD5WkjoxKConU0BtBXDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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