SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '705af4e4a0897ca61fed74f7d59db9fd52010e709fbee5ff6631342c300fde59' 
  AND token = 'RahKELBHqzqttztSw8BgvAhZM8X+LADtsS2ojTt5llU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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