SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60add1c6c136e7401375f34f071d8b704fb21d86b6b0979825426f43c6634b69' 
  AND token = 'd2SrUJmshASjyhihtTzGuf0BfBKLMNRXHkA/C3QZRQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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