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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '779be3fa5bbdc67c67036dd52e4300ad4b3443ff5194d54f7f12d4c01b9a623e' 
  AND token = 'NJkbdMb3f+UE03z8isvC+X4Q04LZx5vKESJgFKeHO0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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