SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '197c4e3cdef61f5001d8341a3339765f8a24a22e172d2e4b9a263cb6e56c7269' 
  AND token = 'mGa4zfCUWVHgLC/VBUYo00eLILU6KyL3WqNj7TI0hzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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