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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f72a15cf523e9f9f46b3acb6fbd9cd7fa3dc07f43f4c6d869efb270e0badba45' 
  AND token = 'YaIg5Wc02UMw+QElLVaw29+K9JQjMAx+o7l4tcgg0J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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