Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87df615702dafc3ad5d659ef6805baa00468f5573b937ad78f7e7ba38479564' 
  AND token = '85sK1cOChf6VS0snA1GNkquZ64DZlDskRUM8HxkxUbI=' 
  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"
    }
  }
}