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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14c656eee5beb4d6d7e3a1d368eea9a817e3a84fdf69727c87a7a684adc28953' 
  AND token = 'xi7yFhz5G5CQj+Ezx7Z9RWROCGV7CkSOdaHoZfAGw8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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