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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d26c54daef25a66c5b190a9c028df81c23e3bd1d795c94d24c92bedddf00234' 
  AND token = 'z+ZaIa/sxTXeRixbjKwWACqVEs22tJpcoTVosIpXE5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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