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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c42050bab53e8a21309197c870810ac7fe231a1cf075c2aca48e62b2e64bdf1a' 
  AND token = 'xsaCxjssogv1iAhHgCtTHJEC02NNSIGWxM8ObLv+IXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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