SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b7f44b4c93ad3b405c458955a2b0169b44f859cd8910aab906cb46a47aefb49' 
  AND token = 'XbWQVjNBil1BlHL3wHKVdVOMgsKhaqKriw6X5VSJB+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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