SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '548a032542b2bfad842bd1c473199eb5d37b3ba27a364fe10a9324f2abdc94e7' 
  AND token = '96M58q5uZtlKV38qHVoqq5mHYwuj+0d65B/vD+BCUnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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