SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f3fcb7ff897729f92044f16514133e351532f971ddc0d378b55079943779ef' 
  AND token = 'leeygUp1xMATxuEwhiKIuWvKzhst+dXAxV8UhMzBvQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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