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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89dd8fbd401c615ce4bb19fdd47aee3179d71f484bbdb06a0514cbec91bb11d6' 
  AND token = '/Qtb3WG0O//t5sKqTYcqswIqNYICqHZnJlYlYp7JFk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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