SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '082d790d5c4601b6e90a840a50a51b3732944551317119f96155e30965581881' 
  AND token = 'JqXgbfCVYj+Lr7ZEwLbCgnNvUM3myFnhCfWvGJZVwYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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