SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac225cb02f5b50bcc94bcb6f83a41de324929b82f72f8847c4ade2b4ec4dce1' 
  AND token = '+0KIY8yV1Z9wP7QmJn/0XPsIHlakVjOZfmB+BxnVJu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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